Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc081870213640c8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 18:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4edb5ae0de30a37491140f2efd21fab SHA-1: 6266043513bd1128225cd1271a2d959399f2244c SHA-256: fc081870213640c82fdaf58c8c8dfce5ce87ee6268de2ef8297451991ae6840f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823632d3615---5321417751.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/77158405121.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/80354267849.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lk6kb03drqdbf4o76r58lg7g5c/muxenotes.pdf
    • http://dtcguild.org/clients/80367/File/jowuv.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2d26e5ec---sotikazadarixufuzi.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/83388431951.pdf
    • http://tbvshungviet.com/upload/files/17400397536.pdf
    • http://yuha.be/_files/file/ziwofovizelafozajepakepu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071df5abd299---funagaxisuko.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11e15978f---tusoviketosapimowit.pdf
    • https://unicon-msk.ru/data/files/39594129061.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113abed9228b---bufakenab.pdf
    • http://stonepigments.com/userfiles/file/najeja.pdf
    • https://sedefartphotography.com/resimler/files/periwomutotigipiboxe.pdf
    • http://ever-pioneer.com/upload/files/zuwizomakovama.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h3jnecvl0jm28nkc38ho258bek/mimawivetemefideripesodup.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608c05b46dd95---pomoxemu.pdf
    • http://goldnumber.info/userfiles/file/8262709418.pdf
    • http://dichvutot99.com/webroot/img/files/xikof.pdf
    • http://jlm-kg.com/uploads/file/11816604740.pdf
    • http://ramenzoni.eu/userfiles/files/59925406932.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a64604165f52f945d26fa15d79f12980/baguwibunegoligozono.pdf
    • http://hiredriver.com/uploads/assets/files/94426620069.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=niif+vigentes+2019+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3de.bin
b0f2bc0572514b4da640da727e17f112b52eca59bfd2958fa3357aeb9b5da4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 10748 bytes
font_01_sfnt_off0000ec95.bin
9804737a21d1f1307f46e487461e4fc343ec6820d0fde16d655c4c8581ea2856
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 18476 bytes
font_02_sfnt_off00011b37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 16792 bytes